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NEOCOLONIALISM: CONSTRUCTION AND SOLUTIONS
Title
NEOCOLONIALISM: CONSTRUCTION AND SOLUTIONS.
Creator
Parenti, Stephanie, Houghton, David, University of Central Florida
Abstract / Description
Many nation-states have their potential for growth hindered by the involvement of developed nations. These low-income nation-states are primarily located on the continent of Africa. There are three parts to this phenomenon of neocolonialism which is the process of continuing involvement of developed nations in developing nations that creates a negative growth in those nations. The research I've conducted is in three parts. The first consists of analyzing the social construction of...
Show moreMany nation-states have their potential for growth hindered by the involvement of developed nations. These low-income nation-states are primarily located on the continent of Africa. There are three parts to this phenomenon of neocolonialism which is the process of continuing involvement of developed nations in developing nations that creates a negative growth in those nations. The research I've conducted is in three parts. The first consists of analyzing the social construction of neocolonialism, how the phenomenon occurs, and where it stems from. The second part is to show how this involvement is damaging to the developing nations. I will use examples such as the multinational corporation profit recycling, the life of foreign aid, and unwise economic deals. As it turns out the phenomena brings on the hindrance of developing in the low-income nation. The last part of my research is to come up with an economic improvement plan. For instance, rather than country A trading money (or some monetary value) for a resource in country B, "A" would build a school, hospital, or infrastructure in "B" to improve the conditions in the low-income nation. It is hypothesized that will leave room for growth in both nations without creating harmful economic repercussions because money would be taken out of the equation.
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Date Issued
2011
Identifier
CFH0003774, ucf:44769
Format
Document (PDF)
PURL
http://purl.flvc.org/ucf/fd/CFH0003774
Assessing Institutional Response to Sexual Violence on College Campuses: The Relationship Between Organizational Characteristics of Colleges and Adherence to National Guidelines
Title
Assessing Institutional Response to Sexual Violence on College Campuses: The Relationship Between Organizational Characteristics of Colleges and Adherence to National Guidelines.
Creator
Macri, Lisa, Burg, Mary Ann, Anderson, Kim, Yegidis, Bonnie, McMahon, Sarah, Potter, Roberto, University of Central Florida
Abstract / Description
This dissertation is a cross sectional exploratory study assessing adherence to the federal campus sexual violence Clery Act and Title IX guidelines among a national sample of (n=94) institutions of higher education (IHE) to determine if there are any relationships between organizational characteristics and CSV policy adherence using a three-part index of compliance: (1). Levels of IHE compliance to federal policies; (2). Levels of IHE provision of CSV prevention services and programs; and (3...
Show moreThis dissertation is a cross sectional exploratory study assessing adherence to the federal campus sexual violence Clery Act and Title IX guidelines among a national sample of (n=94) institutions of higher education (IHE) to determine if there are any relationships between organizational characteristics and CSV policy adherence using a three-part index of compliance: (1). Levels of IHE compliance to federal policies; (2). Levels of IHE provision of CSV prevention services and programs; and (3). Levels of IHE provision of CSV interim and supportive measures. Resource Dependency Theory (Pfeffer (&) Salancik, 1978) informed the study's primary hypothesis that an IHE's reliance on federal financial aid would positively correlate to higher scores on the measures of IHE CSV compliance. Results from regression analyses found a statistically significant (p(<).001) relationship between the receipt of federal student aid dollars by all IHE in the sample and the scores on all levels of the compliance measure. For each federal student aid dollar received, total compliance scores increased by 4 points for all IHE in the sample. Other IHE characteristics, such as the presence of a recent Title IX investigation, were assessed in regard to their relationship to compliance levels. Findings of this exploratory study suggest provisional support for the application of RDT to IHE compliance behaviors regarding campus sexual violence. Additionally, two-year IHE in the sample had statistically significantly lower levels of overall compliance, identifying an opportunity to improve compliance..
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Date Issued
2019
Identifier
CFE0007492, ucf:52631
Format
Document (PDF)
PURL
http://purl.flvc.org/ucf/fd/CFE0007492
NONLINEAR OPTICAL PROPERTIES OF ORGANIC CHROMOPHORES CALCULATED WITHIN TIME DEPENDENT DENSITY FUNCTIONAL THEORY
Title
NONLINEAR OPTICAL PROPERTIES OF ORGANIC CHROMOPHORES CALCULATED WITHIN TIME DEPENDENT DENSITY FUNCTIONAL THEORY.
Creator
Tafur, Sergio, Kokoouline, Viatcheslav, University of Central Florida
Abstract / Description
Time Dependent Density Functional Theory offers a good accuracy/computational cost ratio among different methods used to predict the electronic structure for molecules of practical interest. The Coupled Electronic Oscillator (CEO) formalism was recently shown to accurately predict Nonlinear Optical (NLO) properties of organic chromophores when combined with Time Dependent Density Functional Theory. Unfortunately, CEO does not lend itself easily to interpretation of the structure activity...
Show moreTime Dependent Density Functional Theory offers a good accuracy/computational cost ratio among different methods used to predict the electronic structure for molecules of practical interest. The Coupled Electronic Oscillator (CEO) formalism was recently shown to accurately predict Nonlinear Optical (NLO) properties of organic chromophores when combined with Time Dependent Density Functional Theory. Unfortunately, CEO does not lend itself easily to interpretation of the structure activity relationships of chromophores. On the other hand, the Sum Over States formalism in combination with semiempirical wavefunction methods has been used in the past for the design of simplified essential states models. These models can be applied to optimization of NLO properties of interest for applications. Unfortunately, TD-DFT can not be combined directly with SOS because state-to-state transition dipoles are not defined in the linear response TD approach. In this work, a second order CEO approach to TD-DFT is simplified so that properties of double excited states and state-to-state transition dipoles may be expressed through the combination of linear response properties. This approach is termed the a posteriori Tamm-Dancoff approximation (ATDA), and validated against high-level wavefunction theory methods. Sum over States (SOS) and related Two-Photon Transition Matrix formalism are then used to predict Two-Photon Absorption (2PA) profiles and anisotropy, as well as Second Harmonic Generation (SHG) properties. Numerical results for several conjugated molecules are in excellent agreement with CEO and finite field calculations, and reproduce experimental measurements well.
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Date Issued
2007
Identifier
CFE0001853, ucf:47372
Format
Document (PDF)
PURL
http://purl.flvc.org/ucf/fd/CFE0001853
COSTA RICA, PANAMA, AND NICARAGUA: EXPLAINING ECONOMIC SUCCESS LEVELS
Title
COSTA RICA, PANAMA, AND NICARAGUA: EXPLAINING ECONOMIC SUCCESS LEVELS.
Creator
Negy, Kevin, Sadri, Houman, University of Central Florida
Abstract / Description
Latin America is a region that has deep roots in Spanish colonialism. Since its independence, many countries in the region have heavily depended on agriculture exports to industrialized states to support their economies. This has led to political theorists to label Latin America as an area full of periphery countries that are exploited for resources by core countries. Costa Rica, Panama, and Nicaragua were not the exception. In recent years, however, a noticeable difference between the...
Show moreLatin America is a region that has deep roots in Spanish colonialism. Since its independence, many countries in the region have heavily depended on agriculture exports to industrialized states to support their economies. This has led to political theorists to label Latin America as an area full of periphery countries that are exploited for resources by core countries. Costa Rica, Panama, and Nicaragua were not the exception. In recent years, however, a noticeable difference between the economies of the countries has helped Costa Rica and Panama become more successful than Nicaragua, on the basis of GDP, GNI, and other similar measures. This thesis attempts to explain this economic difference by analyzing what type of relationship the three countries have had with the United States (which has acted as a regional hegemon) and analyzing how each country has handled economic dependence on agriculture. Through this comparative case study, the thesis tries to add to development and dependency theory literature.
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Date Issued
2013
Identifier
CFH0004416, ucf:45109
Format
Document (PDF)
PURL
http://purl.flvc.org/ucf/fd/CFH0004416
Prediction of Optical Properties of Pi-Conjugated Organic Materials for Technological Innovations
Title
Prediction of Optical Properties of Pi-Conjugated Organic Materials for Technological Innovations.
Creator
Nayyar, Iffat, Masunov, Artem, Saha, Haripada, Stolbov, Sergey, Gesquiere, Andre, University of Central Florida
Abstract / Description
Organic ?-conjugated solids are promising candidates for new optoelectronic materials. The large body of evidence points at their advantageous properties such as high charge-carrier mobility, large nonlinear polarizability, mechanical flexibility, simple and low cost fabrication and superior luminescence. They can be used as nonlinear optical (NLO) materials with large two-photon absorption (2PA) and as electronic components capable of generating nonlinear neutral (excitonic) and charged ...
Show moreOrganic ?-conjugated solids are promising candidates for new optoelectronic materials. The large body of evidence points at their advantageous properties such as high charge-carrier mobility, large nonlinear polarizability, mechanical flexibility, simple and low cost fabrication and superior luminescence. They can be used as nonlinear optical (NLO) materials with large two-photon absorption (2PA) and as electronic components capable of generating nonlinear neutral (excitonic) and charged (polaronic) excitations. In this work, we investigate the appropriate theoretical methods used for the (a) prediction of 2PA properties for rational design of organic materials with improved NLO properties, and (b) understanding of the essential electronic excitations controlling the energy-transfer and charge-transport properties in organic optoelectronics. Accurate prediction of these electro-optical properties is helpful for structure-activity relationships useful for technological innovations.In Chapter 1 we emphasize on the potential use of the organic materials for these two applications. The 2PA process is advantageous over one-photon absorption for deep-tissue fluorescence microscopy, photodynamic therapy, microfabrication and optical data storage owing to the three-dimensional spatial selectivity and improved penetration depth in the absorbing or scattering media. The design of the NLO materials with large 2PA cross-sections may reduce the optical damage due to the use of the high intensity laser beams for excitation. The organic molecules also possess self-localized excited states which can decay radiatively or nonradiatively to form excitonic states. This suggests the use of these materials in the electroluminescent devices such as light-emitting diodes and photovoltaic cells through the processes of exciton formation or dissociation, respectively. It is therefore necessary to understand ultrafast relaxation processes required in understanding the interplay between the efficient radiative transfer between the excited states and exciton dissociation into polarons for improving the efficiency of these devices. In Chapter 2, we provide the detailed description of the various theoretical methods applied for the prediction as well as the interpretation of the optical properties of a special class of substituted PPV [poly (p-phenylene vinylene)] oligomers. In Chapter 3, we report the accuracy of different second and third order time dependent density functional theory (TD-DFT) formalisms in prediction of the 2PA spectra compared to the experimental measurements for donor-acceptor PPV derivatives. We recommend a posteriori Tamm-Dancoff approximation method for both qualitative and quantitative analysis of 2PA properties. Whereas, Agren's quadratic response methods lack the double excitations and are not suitable for the qualitative analysis of the state-specific contributions distorting the overall quality of the 2PA predictions. We trace the reasons to the artifactual excited states above the ionization threshold. We also study the effect of the basis set, geometrical constraints and the orbital exchange fraction on the 2PA excitation energies and cross-sections. Higher exchange (BMK and M05-2X) and range-separated (CAM-B3LYP) hybrid functionals are found to yield inaccurate predictions both quantitatively and qualitatively. The failure of the exchange-correlation (XC) functionals with correct asymptotic is traced to the inaccurate transition dipoles between the valence states, where functionals with low HF exchange succeed. In Chapter 4, we test the performance of different semiempirical wavefunction theory methods for the prediction of 2PA properties compared to the DFT results for the same set of molecules. The spectroscopic parameterized (ZINDO/S) method is relatively better than the general purpose parameterized (PM6) method but the accuracy is trailing behind the DFT methods. The poor performances of PM6 and ZINDO/S methods are attributed to the incorrect description of excited-to-excited state transition and 2PA energies, respectively. The different semiempirical parameterizations can at best be used for quantitative analysis of the 2PA properties. The ZINDO/S method combined with different orders of multi-reference configuration interactions provide an improved description of 2PA properties. However, the results are observed to be highly dependent on the specific choice for the active space, order of excitation and reference configurations.In Chapter 5, we present a linear response TD-DFT study to benchmark the ability of existing functional models to describe the extent of self-trapped neutral and charged excitations in PPV and its derivative MEH-PPV considered in their trans-isomeric forms. The electronic excitations in question include the lowest singlet (S1) and triplet (T1†) excitons, positive (P+) and negative (P-) polarons and the lowest triplet (T1) states. Use of the long-range-corrected DFT functional, such as LC-wPBE, is found to be crucial in order to predict the physically correct spatial localization of all the electronic excitations in agreement with experiment. The inclusion of polarizable dielectric environment play an important role for the charged states. The particle-hole symmetry is preserved for both the polymers in trans geometries. These studies indicate two distinct origins leading to self-localization of electronic excitations. Firstly, distortion of molecular geometry may create a spatially localized potential energy well where the state wavefunction self-traps. Secondly, even in the absence of geometric and vibrational dynamics, the excitation may become spatially confined due to energy stabilization caused by polarization effects from surrounding dielectric medium.In Chapter 6, we aim to separate these two fundamental sources of spatial localization. We observe the electronic localization of P+ and P- is determined by the polarization effects of the surrounding media and the character of the DFT functional. In contrast, the self-trapping of the electronic wavefunctions of S1 and T1(T1†) mostly follows their lattice distortions. Geometry relaxation plays an important role in the localization of the S1 and T1† excitons owing to the non-variational construction of the excited state wavefunction. While, mean-field calculated P+, P- and T1 states are always spatially localized even in ground state S0 geometry. Polaron P+ and P- formation is signified by the presence of the localized states for the hole or the electron deep inside the HOMO-LUMO gap of the oligomer as a result of the orbital stabilization at the LC-wPBE level. The broadening of the HOMO-LUMO band gap for the T1 exciton compared to the charged states is associated with the inverted bond length alternation observed at this level. The molecular orbital energetics are investigated to identify the relationships between state localization and the corresponding orbital structure.In Chapter 7, we investigate the effect of various conformational defects of trans and cis nature on the energetics and localization of the charged P+ and P- excitations in PPV and MEH-PPV. We observe that the extent of self-trapping for P+ and P- polarons is highly sensitive on molecular and structural conformations, and distribution of atomic charges within the polymers. The particle-hole symmetry is broken with the introduction of trans defects and inclusion of the polarizable environment in consistent with experiment. The differences in the behavior of PPV and MEH-PPV is rationalized based on their orbital energetics and atomic charge distributions. We show these isomeric defects influence the behavior and drift mobilities of the charge carriers in substituted PPVs.
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Date Issued
2013
Identifier
CFE0005110, ucf:50722
Format
Document (PDF)
PURL
http://purl.flvc.org/ucf/fd/CFE0005110